Sliding Window Roller

A home owner from California says:
I am looking for 3/8" dia. concave steel (?) rollers in plastic housing like the one shown in the picture. The casing is 1 9/16" long, 1/4" wide, and 3/8" high. (The one in the picture was taken from one of the sliding windows in a '60's house that I have recently purchased; another window, just like it, is missing its rollers.) I do not see any writing on it.
I have looked on your site and the closest match I found had a flat wheel. (It was TOMRAY TYCO 66 WINDOW ROLLER, 3/8" FLAT WHEEL Product Code: 87-175.)

Could you help me track down a suitable replacement? Thank you!
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Paul from SWISCO responded:

We agree with your recommendation. Our 87-175 window roller does seem to match up with yours. From what I can see in your photos, the wear on the use of the windows, the track wore the groove in the wheel. So with our rollers being flat this may work just fine for you. 

A home owner from California says:
Dear Sir,

Thank you very much for considering my question. I appreciate it. I will give the 87-175 a try.

Best,

J. Haggarty
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